Call USCIS at 800-375-5283 (M-F 8am-8pm Eastern)
I got through immediately by saying the following.
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Reschedule interview.
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Interview.
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I do not have my receipt.
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No, thank you.
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<You will be asked if they can help with anything else>
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Reschedule interview.
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Interview.
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<You will be put through>
我是周三6pm 打進去的,完全按照上麵一步一步說的,給轉了live agent, waiting time 4 分鍾。